github.com/waldiirawan/apm-agent-go/v2@v2.2.2/internal/apmhttputil/remoteaddr.go (about)

     1  // Licensed to Elasticsearch B.V. under one or more contributor
     2  // license agreements. See the NOTICE file distributed with
     3  // this work for additional information regarding copyright
     4  // ownership. Elasticsearch B.V. licenses this file to you under
     5  // the Apache License, Version 2.0 (the "License"); you may
     6  // not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing,
    12  // software distributed under the License is distributed on an
    13  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    14  // KIND, either express or implied.  See the License for the
    15  // specific language governing permissions and limitations
    16  // under the License.
    17  
    18  package apmhttputil
    19  
    20  import (
    21  	"net/http"
    22  	"strconv"
    23  )
    24  
    25  // RemoteAddr returns the remote (peer) socket address for req,
    26  // a server HTTP request.
    27  func RemoteAddr(req *http.Request) string {
    28  	remoteAddr, _ := splitHost(req.RemoteAddr)
    29  	return remoteAddr
    30  }
    31  
    32  // DestinationAddr returns the destination server address and port
    33  // for req, a client HTTP request.
    34  //
    35  // If req.URL.Host contains a port it will be returned, and otherwise
    36  // the default port according to req.URL.Scheme will be returned. If
    37  // the included port is not a valid integer, or no port is included
    38  // and the scheme is unknown, the returned port value will be zero.
    39  func DestinationAddr(req *http.Request) (string, int) {
    40  	host, strport := splitHost(req.URL.Host)
    41  	var port int
    42  	if strport != "" {
    43  		port, _ = strconv.Atoi(strport)
    44  	} else {
    45  		port = SchemeDefaultPort(req.URL.Scheme)
    46  	}
    47  	return host, port
    48  }
    49  
    50  // SchemeDefaultPort returns the default port for the given URI scheme,
    51  // if known, or 0 otherwise.
    52  func SchemeDefaultPort(scheme string) int {
    53  	switch scheme {
    54  	case "http":
    55  		return 80
    56  	case "https":
    57  		return 443
    58  	}
    59  	return 0
    60  }